Improvement in xfunding-mills



2 Sheets-Sheet 1 J H RUSK. GRINDING MILL.

NO 110,397. Patented Dec. 20-, 1870.

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J. H. RUSK. GRINDING MILL.

Patented Dec. 20, 1870.

n4: NORRlS PETERS c0 PHOTO-LYING WASNINGYON u.

new side] JOHN H RUSK, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 110,391, dated December 20, 1870 sntedated December 9,- 1870.

IMPROVEMENT m cumulus-muss.

The Schedule referred to in the Letters Patent and making part ofthc some.

I, dorm H. Ross, of Philadelphia, county of Phila delphia, State of Pennsylvania, have invented certain Improvements in Grinding-Mills, of which the following'is a specification 7 Nature and Object of the Invention.

My invention consists of certain Improvements in GrindingMills fully described hereafter, wherebythe construction of the mill is simplified, the fitting of the :parts together facilitated, and the mill rendered more eiiicient in operation, moredurable, and less liable 'to get out of order than those of the usual construction.

I General Description. A rcpresents the foundation-plate of the mill; and

in suitable bearings a on this plate turns the horizontal driving-shaft B, the latter carrying a bevol-' wheel, I), gearing into a bevel-wheel, D, on a vertical shaft, E, which turns below in the foundatiomplate A and above in a projection from the hollow base F of the mill, the latter being connected. to the foundation-plate by suitable'columns b b.

' Above the bevel-wheel D and adapted to the vertical shaft E is a pinion, E, gearing into the cog-wheel Goa the mill-spindle H.

It may be' remarked here that while the bevel-wheel D is keyed or othcrwise secnred to the shaft E, the pinion E is loose thereon, but is connected to the wheel Dlby pins 0 c of such metal or alloy and of such strength that, while they will serve as mediums for transmittingfrom the driving-shaft. to the mill-spindle power sufiicient for all ordinary grinding purposes, the

pins will yield should a piece of iron gain access to the mill, or should the latter be subjected to any excessive strain which might impair its integrity, the pins thus acting as safety mediums for preventing accidents.

It will be evident that the bevel-wheel D may be loose and the wheel E fast on the shaft, or the driving-pulley} may be situated close to the bevel-wheel D, the latter being loose on the shaft B, and the two being coupled together by safety-pins c c, which I, however, prefer to arrange in the manner illustrated in fig. 1 and described above. The lower end of the mill-spindle H turns in a footstep, H, secured to the foundation-plate A, the cx treme lower end of the spindle turning in and being supported by a cup, (I, so adapted to the foot-step as to 7 both' slide and tum freely therein,and hav'ing on its under side a-conical recess adapted to the bent end of a lever, e, which projects through a slot inthe footstep, and which hung toa project-ionon the foun dation-plate.

- J is theouter shell of the mill, having a flange, f, adapted to a recess in the hollow'base F, and secured to the iattena flanged cover or bridge,'K, beingsecured to the. upper edge ofthe outer "shell, to the lower edge of which is attached, by simple pins, the

intermediate grinding-plate K; and beneath the latter the lower grinding-plate L rests on, and is attached, by pins, to a disk, M, which is secured to or forms a part of the mill-spindle H, the latter being provided with two burs,N and P, and the upper bur, N, hav

ing breaking-teeth or projections, h, and the lower bur vertical teeth, of the form illustrated in fig. 7.

Both burs have grooves adapted to a permanent key or feather onthe mill-spindle, and both are con fined to the intermediate grinding-plate L bya sleeve,

i, on the top of which bears a disk or washer, j, confined to the mill-spindle by a set-screw or bolt, k, the sleeve being adapted to and 'arrangedto revolve (with the spindle) in a suitable bearing in the cover or bridge K A flange, m, on the under side of this cover,- fits snugly within the outer shell J, as also do the two conical grinding sections R and S, which form the in nor shell of the mill. 1

Four inclined planes, n, are formed on the under side of the flange m, as will be best observed on reference to fig. 4, and corresponding planes are formed on the upper edge of the section B of the shell, the lower edge of which has inclined planes corresponding with similar planes on the upper edge of the section of the shell.

When the sections have been fitted to the outer shell-and the cover K secured to the same, and the mill-spindle be turned in the direct-ion of the arrow,

'fig.'3, the tendency of the burs and the material acted on by them will be to turn the two sections It and S in the same'direction, but this will be resisted by the inclined planes above mentioned, which will tend .to render the sections self-locking to the outer shell, within which the said scctions'will be too tightly jammed to need further fastenings.

The material to be ground, after being introduced to the mill through theopening q in the cover, is first acted on by the coarse teeth of the upper section B or the inner shell and those of the bur N, after which it is further broken and granulated bythe fine teeth of the lower section S, and those of the lower bur P, until the material is in a condition to enter the space a; between the intermediate grinding-plate K and the lower grinding-plate L. I

As the material enters this space, however, it is still further triturated by the teeth t on the ed e of the opening of the plate K, fig. 6, and .those'oi the lower bur.

After'gaining access to the space between the plates K and L the granulated material passes first downward and then horizontally, until it is finally discharged from between the plates (after being thoroughly pulverized by the same) into the interior of the hollow base 1 from which it may be directed by a suitable arm onscraper to the spout w, fig. 2.

The dress of these grinding-plates K and L may be modified to suit the character of the material to be ground. V v It the material possesses the toughness gr hardness of bones or quartz, I prefer the dress illustrated in fig. 7, where it will be observcd that the dress consists of radial teeth, 1;, terminating near the edge in pointed or chisel-shaped teeth. Care should be taken, how ever, that the points of the teeth of one plate should coincide with thecircnlar recesses between the pointed teeth of the other plate, as shown'in fig. 3L

It is essential that the-'cast-iron of? which the plates K and L are made should be of a very hard quality,

and that the fitting-oi the plate K'to the lower edge of the outer shell, and that of the lower plate L to the disk M, should be as accurate as possible; otherwise frequent fractures of the plates must occur, and the necesszu'y hardness of the metal precludes the use of ordinary tools for producing accurate fits.

In. order to overcome this ditficulty I cast in the u er face of the late K one two or more annular P a 7 recesses, and having filled these with comparatively soft metal oralloy, (Babbitt metal, for instance,) I face the same in a lathe, so thatit may fit accurately to the tinned surface of the under edge of the outer shell J ,with which the hard metal of the plate may be free from contact.

In like manner the soft .metal y in the recesses of the under plateL is faced, so that it may fit-accura'tely to the disk M.

My improved grinding-mill is peculiarly constructed, and its parts so arranged as to permit the ready removal of those operating portions which are most liable to rapid deterioration. v 1

On removing the cm or K, for instance, the two sections R and S can be at once withdrawn, as, also, can the burs N and P, after simply withdrawing the setsorew k and sleeve 'i.

Should it be necessary to gain access to or remove; the plates K and L, (and this is not frequently required,) the ontershell J must be detached-from'the hollow base B with the cover-burs, and sections R and S,- leaving behind the two plates K and L, which can be withdrawn through the opening in the top of the hollow-base without disturbing the mill-spindle' H, or'it-s disk M, for it should be understood that theplate K is'connected to the outer shell J by simple pins only, to prevent the former from turning, and i that the plate L is connected to the disk M with like pins, so that one must turn with. the other, although .the pins will not-interfere with the rising of one independently of the other.

It will be evident that-an inner lining made in. one piece may be confined to' and rendered self-locking within an outer shell in the manner described, 01' that I the inner grinding-shell may be composed of more than two sections, and made seli locking, as described; also, that recesses may be formed in the exterior of the linings or sections,.and filled with -soft metal, so as to insure a true fit to the interior of the outer shell in the same manner as I have described in referenceto the fitting of the plates K and L; but this mode of fitting is more importantwhen employed in connection with the latter plates than with the above-mentioned sections.

\Vhile the foot-step H afi'ords a steady'beariug laterally for the lower end of the mill-spindle, the latter inclined planes on the cover or bridge of the mill, and

similar inclined planes on the section or sections, all substantially inthe manner described.

. 3. The detachable sections, having at their backs recesses filled with s'oftmetal, as set ibrtln '4. The combination of the rotating spindle H, its

burs I N, cross-piece K, sleeve 1' extending through said cro'ss=piece, and set-screw k, substantially as described.

'5. The outer shell or casing J, receiving the detachable sections It S, and sustaining the section K, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. JOHN H. RUSK. \Vitnesses:

J OHN WHITE, LOUIs Boswsnn. 

